<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS3新样式</title>
    <style>
      .box{
        background: #5eec1b;
        height: 100px;
        width: 500px;
        border-radius:20px;
        text-align: center;
        margin: auto;
        font: 22px arial;
        color: #3e15e0;
        box-shadow:5px 5px 5px #000 ,inset 5px 5px 5px #81964b;
      }
    </style>

  </head>
  <body>
    <div class="box">
      我是一个盒子。
    </div>
  </body>
</html>
